Can you guys give me some numbers for what it cost, materials only, to install a typical septic system that includes all the pipe, septic tank, dosing tank, distribution box, and all necessary aggregate and misc. expenses? There is also a mandatory perimeter drain. Also, for anyone who installs mound systems (which I'm not familiar with), what is an average or ballpark price to build one of those, materials only, and how much sand and stone do you typically bring in? I know materials, especially aggregate, varies from region to region. I'm just trying to get some average prices on cost.